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WAEC Mathematics 2019 Objective — Question 18

Question 18 of 145 from the West African Examinations Council (WAEC) Mathematics 2019 Objective paper, with the correct answer and a full explanation.

18. If (0.25)ʸ = 32, find the value of y.

A. y=-5/2Correct
B. y=-3/2
C. y=3/2
D. y=5/2

Explanation

(0.25)ʸ=(1/4)ʸ=(2⁻²)ʸ=2⁻²ʸ=32=2⁵. So −2y=5 ⇒ y=−5/2.

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